Crc Error/Bit Error - Fluke 635 User Manual

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Users Manual
LED will illuminate solid to indicate a frame error is present and will flash to
indicate a history of frame errors.
2-8.

CRC Error/Bit Error

BPV Error
Frame Err
T1
CRC Error
If the test set establishes frame sync with an ESF-framed signal, it will detect
and count cyclic redundancy check (CRC) errors. The CRC is a check-sum
message that is transmitted in the facility data link (FDL) associated with ESF
framing. The red CRC ERR LED will illuminate solid to indicate a CRC error
is present and will flash to indicate a history of CRC errors.
Bit Error
In order to record a bit error, the test set has to be synchronized with a test
pattern. Therefore, bit errors are registered only if a BERT pattern is present.
Pattern synchronization is indicated by the green Pattern LEDs. Each time the
unit detects an errored bit in the pattern it is receiving, one bit error is recorded.
The red BIT ERR LED will illuminate solid to indicate a bit error is present
and will flash to indicate a history of bit errors.
2-6
RB Int
0
0
CSU
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